Einstein’s field equations for stationary Bianchi type II models with a perfect fluid source are investigated. The field equations are rewritten as a system of autonomous first order differential equations. Dimensionless variables are subsequently introduced for which the reduced phase space is compact. The system is then studied qualitatively using the theory of dynamical systems. It is shown ...

Abstract In this work, we study a cosmological model of Bianchi type-I Universe in teleparallel gravity for perfect fluid. To obtain the solution model, assume that deceleration parameter (DP) is linear function Hubble H i.e. q = ?1 + ?H (where ? as positive constant). Consequently, get our Universe, where it goes from initial phase to current acceleration. We have discussed some physical and g...

Evolution of an anisotropic universe described by a Bianchi type I (BI) model in presence of nonlinear spinor field has been studied by us recently in a series of papers. On offer the Bianchi models, those are both inhomogeneous and anisotropic. Within the scope of Bianchi type VI (BVI) model the selfconsistent system of nonlinear spinor and gravitational fields are considered. The role of inho...

We introduce the notion of topological fragility and briefly discuss some examples from the literature. An important example of this type of fragility is the way globally anisotropic Bianchi V generalisations of the FLRW k = −1 model result in a radical restriction on the allowed topology of spatial sections, thereby excluding compact cosmological models with negatively curved three-sections wi...

Bianchi type V I0 bulk viscous massive string cosmological models using the technique given by Letelier (1983) with magnetic field are investigated. To get the deterministic models, we assume that the expansion (θ) in the model is proportional to the shear (σ) and also the fluid obeys the barotropic equation of state. The viscosity coefficient of bulk viscous fluid is assumed to be a power func...